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Can glass be “threaded”?

Discussion in 'Ask FC' started by Mr. Me2, Jun 10, 2018.

  1. Mr. Me2

    Mr. Me2 Well-Known Member

    Messages:
    2,364
    To all glass workers out there - Is it possible to create a glass stem that is in 2 pieces? And that one connects to the other by screwing them together?

    If so (hopefully), could one piece also be designed as the oven with a permanent screen (preferably of glass). The other piece that screws on would have its own screen to serve as a lid.

    Doable?
     
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  2. btka

    btka Well-Known Member

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    Dynavaper likes this.
  3. Mr. Me2

    Mr. Me2 Well-Known Member

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    Another good idea! All depends on fit, I guess.

    I still don’t want to give up on the stem design (which is fully integrated) just yet. It can probably be done with other materials, but I’m curious if it can be done in glass.
     
    btka likes this.
  4. Dynavaper

    Dynavaper Karma Farmer & Dynavap Maniac

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    Location:
    Europe
    I am positive that it is possible, but abrasion and wear with glass on glass will probably be quite severe. I would rather stuff the two glass pieces into metal holders that get screwed together instead.
     
  5. Mr. Me2

    Mr. Me2 Well-Known Member

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    And I was thinking about safety, taste, and uniformity of diameter.
     
  6. btka

    btka Well-Known Member

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    Dynavaper likes this.
  7. Ratchett

    Ratchett Vape Accessories Delta3DStudios.com Accessory Maker

    Messages:
    4,057
    It's possible to create threads on glass, however this is not very practical for a variety of reasons including the inability to fully compensate for dimensions due to the unpredictability in shrink/contraction once baked in a kiln.

    I've seen threads in glass, but they are typically polished and mate with a non-glass component via a loose fit.

    That's why laboratory glass uses a tapered frosted glass fitting for mating glass - perfect air tight fit regardless of how much the glass might shrink during production/annealing.
     
  8. Dan Morrison

    Dan Morrison Well-Known Member Manufacturer

    Messages:
    756
    I looked into this a while ago. Lab glass is available with diamond cut precision threads. But a stem like you're describing would be very expensive. It would be a custom job in a very specialized industry. I wouldn't be surprised if it came to $100 a stem for small batch production.

    The issue is mainly the wall thickness. A straight tube needs to experience a diameter change..or a change in wall thickness...to accomodate the cut thread, if you want to end up with the whole piece having the same OD the entire length. This adds a lampworking step to the manufacturing process.

    A more practical solution would be to have two straight stems mated with a metal connector. Each end of the connector could be fitted with O-Rings that press on the ID of the glass tubes. It's just a snug press fit. Make one side fit more snug, so that it doesn't pop out when you separate the two halves.

    hmmm.
     
  9. Hippie Dickie

    Hippie Dickie The Herbal Cube Manufacturer

    Messages:
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    Location:
    where the Cube rules!
    there are threaded vials and test tubes that take a plastic cap - only a couple dollars each - so a threaded collar could couple two pieces together.

    but, if it gets knocked over it will most likely break the glass ... i had one knock-over-glass-break 10 years ago and my design ever since has been for glass that falls away from the vape if dropped or knocked over, to try to minimize collateral damage to the glass heater tube.
     
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  10. Mr. Me2

    Mr. Me2 Well-Known Member

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    2,364
    Can’t tell you how happy I am that you’re here and that this may have helped you.

    After all, this thread was really started with you in mind...
     
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